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| 型号： | A8507ELBTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 5/17页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER WLED/RGB 24-SOIC |
| 标准包装： | 3,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 250kHz ~ 1MHz |
| 电源电压： | 4.3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
A8507
LED Backlight Driver for LCD Monitors and Televisions
ELECTRICAL CHARACTERISTICS Valid at V IN = 5 V; T A = 25°C, R FSET = 52 k Ω , R ISET = 12.4 k Ω , except
specifications guaranteed over the full operating temperature range with T A = T J , unless otherwise noted
indicates
Characteristics
Input Voltage Range
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Supply Current 2
Symbol
V IN
V UVLO
V UVLOHYS
I VIN
Test Conditions
V IN Falling
Switching at no load
Shutdown, EN = V IL , T A = 25°C
Standby, EN = V IH , PWM = V IL , soft start
completed
Min.
4.3
–
–
–
–
–
Typ. 1
–
–
0.1
7
0.1
1
Max.
5.5
4.0
–
–
1
2
Unit
V
V
V
mA
μ A
mA
Boost Controller
Switching Frequency
f SW
0.8
1
1.25
MHz
Minimum Switch Off-Time
Minimum Switch On-Time
t off(min)
t on(min)
Driver output
Driver output
–
–
72
72
–
–
ns
ns
Logic Input Levels (EN and PWM pins)
Input Voltage Level Low
Input Voltage Level High
V IL
V IH
–
1.5
–
–
0.4
–
V
V
Input Leakage Current 2
I IN
EN = PWM = 5 V
–
100
–
μ A
Driver Section
High Side Gate Drive On Resistance
Low Side Gate Drive On Resistance
Driver to GND Resistance During Shutdown
Sense Overcurrent Threshold Voltage
R DS(on)H
R DS(on)L
R SDOFF
V SEN
Measured at V GATE = V IN / 2
Measured at V GATE = V IN / 2
V SENP – V SENN
–
–
–
80
9
10
125
95
–
–
–
110
Ω
Ω
k Ω
mV
LED Current Sinks
LEDx Pin Regulation Voltage
I SET to I LEDx Current Gain
ISET Pin Voltage
V LEDx
A ISET
V ISET
I LED = 80 mA
I SET = 100 μ A
–
–
–
1
640
1.235
–
–
–
V
A/A
V
I SET Allowable Current
Range 2
I SET
41
–
125
μ A
LEDx Accuracy 3
LEDx Matching 4
LEDx Switch Leakage Current 2
Err ILEDX
Δ I LEDX
I SL
LED1 through LED6 = 1 V, at 100% Current
LED1 through LED6 = 1 V, I SET = 100 μ A
V LEDx = 12 V, EN = 0
–3
–3
–
±0.6
±0.6
0.1
3
3
–
%
%
μ A
Soft Start
Soft Start Sense Threshold Voltage
Soft Start LEDx Current Limit Relative to LED
100% Current
V SENS
I LED(SS)
Sense voltage for boost switch current
sensing
Current through enabled LEDx pins during
soft start
–
–
28.5
8
–
–
mV
%
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
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